Want to know how to soundproof a hole in your wall?

It depends on what type of hole it is. If it’s a small hole that is the result of some damage and you simply want to fill in, then I would advise that you use expanding foam. The stuff I have used in the past is available on Amazon – just don’t squeeze too much as it expands massively, and use sanding paper afterwards to tidy things up.

But, if it’s a hole that’s meant to be there, or is part of the construction of the room itself, it’s going to be a little trickier as there are times when a hole is placed in a wall for a specific purpose.

The offending hole could be a way of accessing a heating system, or it could be there as a means of letting natural light into a room or could be something functional like a serving hatch that’s no longer required.

This may not be an issue, but if the noise of the heater, or the people in the room next door, becomes annoying there is a good chance you will want to block the noise out.

If you own the property, you may want to think about a minor re-structure to deal with the problem. But this may not be possible, or you may think that the necessary work would be too expensive.

If you rent a property, then you can only think about using a solution that does not alter the original structure.

If this is the case, you need to find a way to soundproof the hole in the wall.

Let’s start with a really simple and cheap solution first.

Option 1: Insert Foam & Hang a Soundproof Material Over the Space

If it’s a rental property, or you just want something quick and easy that isn’t going to cost a massive amount of money then the best sound dampening method would be to buy some special acoustic foam, cut it to size, and then place it into the hole.

They tend to come as panels, so depending on how deep the hole in the wall is, you will probably want to pad multiple panels together to form a deeper barrier. Double them up, triple them up, go as deep and as thick as you possibly can.

Just make sure you cut it a few millimeters larger than the actual hole, as you will want to push it in so that it’s as snug a fit as possible.

Once that’s done, you can then get even better results by handing some form of soundproofing material over the entire hole space.

Here’s what you will need:

The above method is the cheapest and most simple hack that you can use if you want to know how to soundproof a hole in a wall quickly.

But there is also another method which requires a little more effort, but will look a lot better and will provide better noise reduction.

Option 2: Create a Removable Box Frame

Here is how you can do this, using a box frame made from quarter rounds and some lucite.

The wood and lucite frame that I will show you how to build will not block out very loud noises. But, it should deaden those annoying sounds, such as the heater ticking on an off, or the person in the next bedroom snoring.

You should be able to relax in the room and get some peace and quiet.

Here’s what you need:

Step 1: Measure the Hole

Depending on the depth of hole, you will need to measure it as a cube, as you will need to create a box frame to fill the space.

Remember that the frame needs to be a tight fit as you do not want to have to affix it to the hole in a permanent manner.

It’s worth factoring in a small amount of grip space outside of the hole, so that you can remove the frame if necessary.

Step 2: Create a Wooden Frame

All you need for the frame are some pieces of quarter round; eight for each side of the cube.

Remember to use your measurements of the hole to cut the pieces to the correct length.

You should place the first four pieces in a frame shape and attach them with finishing nails.

Step 3: Create Another Wooden Frame

You will need two of these wooden frames for each side of the box; twelve in all.

You may decide that it’s easier to create just two frames at first, and then finish them off with lucite; or you may want to prepare all of the frames at this point.

You can the finish them all off at one time. 

Step 4: Add the Lucite

You should lay a sheet of lucite into the first frame. You may need to cut the lucite to size using a glass cutter.

Once the sheet is fitted correctly, a second frame should be placed on the other side.

The two frames then need to be connected using finishing nails, leaving the lucite sheet sandwiched in-between.

Step 5: Create the Box

Once all of the double frames are finished off, they need to be put together as a box. You can use finishing nails to do this. Or, you may find it easier to use a glue gun.

Make sure that you choose a glue gun which can be used for working with wood, as there are many different types of glue gun on the market.

Handy Hint: Remember that glue guns can cause burns if they are not used correctly. You should always read the instructions before you start. It’s also a good idea to protect the area where you are carrying out the gluing process, and to wear long sleeves and gloves.

Step 6: Place the Box in the Hole

The completed wood and lucite box needs to be placed into the hole in the wall.

If you measured the hole correctly, the box should be a tight fit. This means that you may have to be patient manoeuvring the box into place.

If you factored in a small amount of grip space, your side of the frame should just slightly overlap the hole. This makes it easier to remove the frame when necessary.

The Last Word

If you find that loud noises are still causing you issues, and the property is rented, you may want to speak to the landlord about creating a more permanent solution.

Is there any way that the hole can be blocked in for instance?

But, for most every day noises this solution should be fine. You have a means of deadening annoying noise which can easily be removed if access is needed, and which does not block any light from the room.